The above is not very “deep” Chinese Pidgin English, but it’s both recognizable as CPE grammar/vocabulary and as the kind of speech that CPE had become after several decades of use on the West Coast.

“Yep”, for instance, strikes me as more a borrowing from local spoken English than anything traceable to Chinese-speakers’ influence on the word “yes”. In the time frame of +/-20 years from 1897, a quick search of Chronicling America’s English-language newspaper archive returns nearly 40,000 instances of “yep”. Here’s the fun #1 search result”: